Introduction. The success in pediatric oncohematological disorders treatment cause increasing scrutiny not only to remission achievement and long-term patient survival, but also to supportive dysfunctions, which go with malignancy and anti-tumor treatment. Blood tumors cause all organs and systems disorders, and psychic dysfunctions of these are not in the last place.Aim. To characterize mental health and psychic disorders types in children and adolescents with oncohematological diseases during hospital stay.Materials and methods. It was analyzed mental health of 169 children and adolescents with hemoblastoses, who were treated at Pediatric Oncology and Hematology Research Institute of National Research Cancer Centre n. a. N. N. Blokhin (Moscow, Russia) in 2022 year. 50 (29.6 %) patients needed a psychiatric consultation. Among oncohematological disorders acute lymphoblastic leukemia was predominated – 25 (50 %), lymphomas – 17 (34 %) and acute myeloid leukemia – 8 (16 %) patients. Mental health data assessed after examination/consultation of clinical psychologist and psychiatrist.Results. Asthenia was found in all 50 (100 %) patients, who were recommended a psychiatrist consultation, in 47 (94 %) – adjustment disorder, in 15 (30 %) – vexatious and neurotic disorder, in 16 (32 %) – affective syndromes, less often (18 and 14 % respectively) – behavioral deviations and eating disorders. As single cases in 2 (4 %) patients an intellectual disability and in 1 (2 %) a psychotic syndrome were diagnosed. As a role the most pronounced psychopathological conditions were upon admission to the hospital and decreased during the treatment and adaptation.Conclusions. One third of children and adolescents, hospitalizing to oncohematological clinic need a psychiatrist consultation. Multidisciplinary care for such patients with pediatric oncologist, psychiatrist and clinical psychologist can cure psychogenic disorder effectively, improving the stay of patient at the hospital and best compliance between the doctor and patient.